butler



Aug. Z5, l1925.

R. S. BUTLER ,POWER CPERATED sHovEL 11 Shgets-Sheet' l Filed Dec. 24, 1923 ...mi .J-

R. s. BUTLER POWER OPERAT'ED SHOVEL Aug. 25, `1925.

Filed nec. 24, 1923 11 sheets-sheet a WKN.

QM m |||||l|||||||| Aug. 25, 1925..

R. S. BUTLER POWER OPERATED sHovEL Filed Dec. 24, 1923 1,1 Sheets-Sheet 4 i w s w ...v i.

S k m Aug. 25, 1925. @551,466

R. s. BUTLER POWER OPERATED SHOVEL Filed Dec. 24, 1925A 11 Sheets-sheet 5 Aug. 25, 1925. 1,551,466

R. s. BUTLER POWER OPERATED SHOVEL Filed nec. 24, 1925 11A sheets-sheet e Aug. 25, 1925. 1,551,466

R. s. BUTLER PowER UPERATE SH01/EL Filed Dec. 24, 1923 l1 She'ets-Sheet 7 Aug. 259

R.l 5. BUTLER POWER OPERATED SHOVEL Filed Deo. 24, 1925 11 Sheets-Sheet' 9 gummi! INI Aug. 25 1925.

R. s. BUTLER POWER OPERATED SHOVEL Filed neo. .24; 1925 11 Sheets-Smet 10 Aug. 25, 19.25

Filed Dec. 24, 1923.

11l Sheets-Sheet l1 Patented Aug. 25, 41925'.

71,551,466 PATENT oFFlcE.

UNITED STAT-Es EoiiEEi s. BUTLER, oir Joram, MISSOURI.

v EowEn-OPERATED siIovEi..

Application led December 24,1923. Serial No. 682,582.

To all 'whom t may concern.' y

Be it known that I, ROBERT S. BUTLER, a lcitizen of the United States, residin at Joplin, in the county of Jasper and tate c of Missourihave invented certain new and useful Im rovements vin Power-Operated Shovels, o which the following is a specification. f

This invention relates to power operated shovels, and is an improvement over the device shown in my lcopending application Serial Number 416,175, filed October 11, 1920.

An object of the invention is to `provide a power operated machine having a clipper and means for operatin the dipper for d igging, and being fuit er provided with means whereby the dipper' may be elevated i at an angle to the base of the and swun machine or the purpose of loading the material into a ear .or other conveyor.

An important object of the invention isthe provision of means whereby the'dipper and its associated arts may be arranged at an angle to the ase during the digging or loading operations to permit the use of the shovel in digging operations where space is restricted, such as in underground min- A further object of the invention is the provision of a machine which mayv be employed in lace of the ordinary scraper for use in smalll drifts and sub-levels and may further be employed -in work now pery formed b large machines, such as digging in large rifts, tunnels, andl rooms. A further object of the invention 1s the provision of a relatively small flexible ma chine which may be readily moved on a mine cage from one level to another andwhich is available for loading in drifts and for comparatively heavy loading in large.I

tunnels.

, A further Objectis the provision of a' simple,light, but rugged machine with low power requlrements adapted to a wide range of service.

A further object is the provision of improved means for elevatin the shovel after the di ging operation for umping.

A yurther object is the provision of a machine in which any of the operations, such `as the forward movement of the shovel,

known as crowding, the elevating movement or the reaching movement prior to dumping may be arrestedby the operator at any drawings, I have i lFigure 2 is a side elevation showing the cylinder, dipper and associated arts in raised position, the operatorspplatibrm being removed,l

Figure 8 is a plan view, Figure 4 is a longitudinal vertical sectonazl view on line 4-4 of Figure 3,

Figure. 5 is a transverse vertical sectional view on line 5-5 of Figure 4,

Figure 6 is a transverse horizontal sectional view on line 6 6 of Figure 5,

Figure 7 is a plan view of the base,

Figure 8. is a detail sectional view on line 8 8 of Figure 5, y r

Figure 9 is a perspective view of the cylinder supporting yoke,

Figurejl() is a detail sectional view on line 10--10 of Figure 4,

Fi ure 11 is a similar View on line 11- 11 o Figure 10, v

Figure 12 is a similar view on line 12- 12 of Figure 10,

Figure 13 is a perspective view of the valve,

Figure 14 is a similar view of the valve sleeve,

Figure 15 is a detail view of a -portion of the frame,

Figure 16 is a front elevation ofthe dash Figure 18 is al detail sectional view on'v line 18-18 of Figure 16,

Figure 19 is a perspective vview of the dipi per lid,

Figure 20 is a similar View Aot' the dipper,

igure 21 isa similar view of the clipper yo e, A

Figure 22 is a similar view of a collar to which the yoke is connected,

Figure 23 is arspeetive view of the cross head Vconnecte to theouter piston rod,

Figure 24 is a detail sectional View on line 24-24 of Figure 4,

Figure 25 is a diagrammatic view of the cylinder, piston rod, shovel and connecting beams showing various positions of these ico llO

l ber l, having suitable bearings 2 for the reeeption of l'ront and rear axles 3. Traction wheels 4 are mounted on these axles and are adapted to travel on the usual rails 5. The cylinder and upper trame are rotatably supported on the base by means of a turn-tab e. A rotatable member consisting of an upper ring 6 and a lower ring7 is-rotatably mounted on the base. These members are provided with'ears 8, adapted to receive bolts 9, by means of which they are secured to each other. As shown, the lower member is provided with a bottom plate 10, which extends beyond the ring forming a flange 11, arranged beneath a portion of the base. The flange 11 and the adjacent portion of the base are provided with race ways for the reception of ball bearings 12. The upper ring 6 is provided with a bottom flange 18, arran edA over the base and 'this flange and the a jacent portion of the base are provided with race ways for thereception o' bearings 14. The upper edge of the upper ring is also provided with a flange 15 and a closure plate 16'is secured to this flange.

rlhe base is provided with a ring gear 17 and the lower ring is provided with a cut out portion 18. A stub shaft 19 is mounted in a bushing 20 in the bottom plate 10 of the lower ring, adjacent the cut out portion of the ring, and this shaft is adapted to receive a pinion 21, meshing with the ring gear 17. A second pinion 22 meshes with the pinion 21 and this pinion is mounted on 'a stub shaft 23, received in a bushing 24 in the bottom plate 10. Above the pinions, there are provided a pair of bearing inembers 25 and 26, which are secured to each other by suitable fastening elements. 'lhe shaft 23 extends through tlie.bearing inembers 2G and a crank 27 is secured to this shaft. The crank 27 carries a pin 28 on its opposite end, adapted to enter a sleeve 29 formed on the ends of a pair of piston rods 30. These iston rods are connected to pistons (not s own), arranged in cylinders 3 of an oscillating engine. The cylinders are pivotally `mounted on pins 32, bolted to the bottom plate 10, the cylinders being provided with ears or sleeves 33, arranged around the pins. The inner ends of the cylinders are adapted to rest upon lugs 34, extending upwardly from the bottom plate. The inner ends of the cylinders are rovided with cylinder heads 35. which are flattened, as at 36 (see Figure 4) to lit beneath the closure plate 16.

The cylinders are connected to a source of pressure by means of a swivel connection eX- tending through the bottom plate 10. As shown, the bottom plate is provided with an opening and a member 37 is arranged be neath this opening. This member is'provided with a passage 38, extending horizontally and is further provided with a vertical rt or passage 39, extending upwardly. A ushing 40 is arranged iii the opening in the bottom plate and this bushing is ada ted to receive and support a member 4l, w ich extends through the opening and is secured to the lower member 37 by means of bolts 42. The member 41 is provided with a passage 43, forming a continuation of the passage 39 in the lower plate. A head 44 is arranged overthe member 41 and this head is provided with a flange 45, extending downwardly beyond the member 41 to retain it on its seat. Suitable fastening elements 46 are passed through this flange and the bushing 40 and are received in the bottom plate. The head 44 is provided with a passage 47 which, as shown, is substantially V-shaped and is connected to outlet pipes 48 and 49. The pipe 49 extends to a point near the periphery of the base and is connected to al flexible hose 50 by means of which air is delivered to the cylinder arranged above the base. The pipe 48 is connected to a valve chest 51, in which a plug'valve (not shown) is arranged. The plug valve is adapted to control communication to the engine cylinders throughv the cylinder valve chest. 52,

thereto. The crank is in turn connected to a link 56 and the end of the link. is connected to `an arm 57 which in turn is connected to a crank 58, arranged on the bottoin of a vertical lever 59. rl`he upper end of this lever is provided with an operating handle 60.

rl'he :trame is secured to the upper ring 6 and is adapted to rotate therewith. As shown, the Aframe consists ot substantially vertical members (31 and inclined members (52 arranged on opposite sides of the niachine. rlhe upper ends ol these arms torni frames (33, arranged on opposite sides of the machine. Each of these trames is provided with a recessed portion forming upper and lower guides (34 and (55, substantially parallel to each other and provided with a stop 66 at the front. The rear of the guides is closed b v plates 6(3, secured to the trames by means of bolts 67. A bushing (38 is arranged in rai-h ol these guides and these bushings are provided with iat upper and lower faces adapted lo engage the upper and lower walls 64 and 65. 'lhese bushings are adapted to -i'eeeive a trunnion 69, shown in detail in Figure 14 of the drawings. A cylinderl yoke 70 (see Figure 9) is provided with a sleeve llO 71, ada ted to receive the trunnionm69. As shown Fsee Figure 52], the ends of the sleeve contact with flanges 2, formed on the bushinUs 68. The yoke is rovided with a cylindrical skeleton frame 173, adapted to receive the rear endof the main cylinder 74. An inner piston 75 and an outer piston 76 are mounted inthis cylinder. lThe inner iston 1s provided with a tubular piston ro 77, the outer end of which is solid, as at 7 8,' and the outer piston is provided with a tubular plston rod 79, surrounding the inner pisto-n rodr The outer end of the cylinder is provided with a head 80, through which the cyhnder rods pass. A tube or conduit 81 is arranged withinthetubular portion 77 of the inner piston rod and this tube extends from the rear end of the cylinder to a point ,adjacent the forward end. The pistons are provided with suitable packing 82 and 83, around their peripheries,l to prevent leakage. n The outer piston rod is provided with suitable packing 84 at its. inner end, retained in position by means of a plug 85,'engaginggjV the exterior of the piston rod 77 to prevent leakage. The inner piston redis likewise provided with suitable packing 86, retained in position bg means of a plug 87 and engaging the tu e 81 to prevent leakage. A pair of )erts 88 and 89 are formed in the inner cylinder head, and the port 88 communi- Cates with the tube 81. Air passing through the tube; 81 is delivered to the interior of the inner piston rod'77 and this piston rod is provided with suitable passages'90, arranged inwardly of the outer piston to permit delivery of air into the cylinder between the pistons. The passage 89 communicates with an openingr extending through the cylinder head to deliver air to the cylinder behind the pistonsl As shown ,(see Figure 1,1) a cup shaped member91vis arranged in this opening and the end of the cup-shaped member is provided with a flange 92, engaging the shoulder formed inthe opening. The inner end of the cup-shaped member is provided with an opening 93, communicating with the interior of the cylinder. The cylinder head is provided with a threaded opening in alinement with the cup-shaped member 91, adapted to receive a plug 94, and a. spring 95 is arranged between the bottom of the cup-shaped member and the plug to normally retain the cup-shaped member in the position shown. The passages 88 and 89 cxtend through a thickened portion in the top of the cylinder yoke and communicate with ports 96 and 97, in theI sleevel 71. The ports 96 and 97 are arranged out of alinement circumferentially of the sleeve. .The sleeve is provided with an exhaust. port 98, which is circumferentially in alinement with the p-ort 97 and vertically in alinement with the port 96.l The trunnion 69 is provided with an' exhaust opening 99, communicating with the with an opening 101, communicating withthe openlng 97 1n the sleeve. An opening 102 is formed in the trunnion adjacent the exhaust opening and communicates with a v passage 103, extending circumfcrentially of the sleeve. The other end of this passage is connected t0 a pipe 104, which is in turn connected to a passage 106 in the outer cylinder head' 80. This passage communicates with a cup-shaped member 107, arranged in an opening in the cylinder head and the inner end of the cup-shaped memberis provided with an opening 108, communicating with the interior of the cylinder. The cupshaped member is normally retained in the position showir'in Figure 4 of the drawings by means of a spring 109, one end of which engages a plug 110. A valve 111 (see Figure 13) is .arranged within the trunnion. This valve is of a modified Gorless type and is capable of reciprocating movement and oscillating movement to connect the passages 88 and 89 and pipe 104 to the source of fluid v pressure. As shown, the valve is provided with substantially semi-circular portions 112 at each end and a cut out portion 113 between the semi-circular ortions. The opposite side of the valve 1s provided with a pai-r of lugs 114, adapted to engage the opposite inner 'face of the trunnion. Ears 115 are arranged on one end ofthe valve and these ears 115 are adapted to receive a leve'r 116 extending through a bushing 117 mounted in one end of the trunnion. A collar 118 is mounted o-n this bushing and is adapted to receive an arm or bracket 119. A hand lever 120 is connected to the lever 116 by means of a pin 121 and this hand lever is provided with a pin 122, adapted to be received in a forked end 123 of the arm or bracket 119. An inlet pipe 124 is arranged in the opposite end of the trunnion and this pipe is connected to the flexible hose 50 by means of which the air or other fluid is delivered from the base of the machine. The pipe 124 forms a swivel connection with the end of the trunnion and is provided with a flange 125 on its inner end, adapted to e11- gage a shoulder formed in the ventral bore of the trunnion. The air pressure within the trunnionforces the flange against the shoulder, forming an air tight connection.

A portion of the outer piston rod 79 extends from the cylinder and provided with a slot 126 and this slot is adapted to receive a pin 127,0carried by the inner piston rod. A collar 128 is mounted on the outer piston rod and this collar is provided with forwardly extending lears 129, having openings formed in their forward ends to IIO receive the pin 127. The collar is also provided with a pair of ears 130, arranged above the piston rods and these ears are adapted to receive a pin 131. The ends of the pin 131 are received in elongated slots 132,- formedin eais 133, on the rear end of a yoke 134. The yoke consists of a pair of diverging arms 135, the rear ends of which are connected by a curved portion or saddle 136. The forward ends of these arms are. provided with ears 137, having openings therein for the reception of pins 138. These pins are received in openings in ears 139, formed on the upper ends of dipper arms 140. Asshown, the dipper arms are each provided with a pair of spaced ears 139, and the ears 137 are arranged between the spaced ears. The lower ends of the arms 140 are secured to the sides 141 of the dipper. As shown, these sidesl are formed of arcuate plates and a curved bottom 142 is secured to the sides in any suitable manner. The upper edges of the sides are provided with oppositely extending latches 143, and the dipper is provided with a lid 144, adapted to be retained in position by means of these latches. As shown, a latch bar 145 eitends transversely of the dipper lid and projects beyondeach side to be engaged by the latches 143. The latch bar is noririally retained in operative position by means ofa spring 146, secured to a clip 147, formed on the latch bar and to a' similar clip. 148, secured to'the dipper lid. 'lhe forward end of the dipper lid is provided with depending ears 149, having openings ,formed therein. These ears extend downwardly, as shown in Figure 24 of the drawings, adjacent the arms 140 and the openings 150 are adapted toreceive pivot pins 151 by means of which the dipper lid is pivotally supported.

The pivot pins 151 aie alsoicceived in openings 152 extending through the side walls of the dipper and the arms 140, which arms are slightly spaced from the inner wall of the dipper. A dipper beam 153 is arranged on each side of the machine, extending substantially throughout the length of the machine and the forward ends of the dipper beams are provided with depending portions 154. which extend int-o the spaces between the arms` 14() and the side. walls of the dipper and are provided with openings for the reception of the pins 151.` The dipper beams form the support for the dipper and the dipper is adapted to oscllate on the pins 151 in digging and dumping. The forward vends of the dipper beams are supported by means ofa cross head consisting of a pair of arms 155 and a collar 156. The collar is arranged around the outer piston rod 79 and, as shown, is slotted, as at 157. The collar is provided with an ear 158, arranged above a portion of one of the arms bearing portions to retain the beams in proper position and the outer ends of the arms are provided with reduced threaded lportions 161, for the reception of nuts to retain the beams in position.

The rear ends of the beams are pivotally connected to guide arms, shown as substantally S-shaped levers 162, arranged on opposite sides of the machine. These guide larms are provided with hubs 163 at their upper ends, adapted to receive a supporting pin or shaft 164, mounted in extensions 165 of the side frames and arranged above the sleeve 71. The hubs 163 are keyed to the shaft 164, as indicated at 166, and the ends of the shaft are adapted to receive nuts 167 or other fastening elements. A pair of diverging arms 168, forming a yoke, are arranged above the cylinder and these arms are connected to a hub 169, loosely mounted on the shaft 164 between the bearing portions 165. The forward ends of the arms 168 are pivotally connected to arms 170, arranged on opposite sides of the machine and the other ends of the arms 170 are pivotally connected to the dipper beams, as at 171.

The diverging arms 168 are provided with depending portions 172 and piston rods 173 are connected to these dependin portions. The piston rods are provided with pistons 173 mounted in the cylinders 174 of a suitable dash pot. The dash 'pot mechanism is arranged on the frame of the machine and consists of a substantially U-shaped member, the legs of which form the cylinders 174 and the base of which forms a reservoir 175 for oil or other liquid. The dash ot mechanism is pivotall supported on tie base of the machine. s shown, ears 176 are arranged on the bottom of the dash pot mechanism and these ears are provided with openings 177 for the reception of pins 178 passing through openings formed in bearing members 179 carried by the upper ring 6. The cylinders 174 are provided with inlet openingslSO, communicating with passages 181. The reservoir 175 is provided with a partition 182, forming a chamber 183, the passages 181 communicating with this chamber. A bonnet' 184 is arranged on the outer face of the reservoir and is provided with a passage 185, communicating with the interior of the reservoir b 186. This bonnet is provided with a threaded opening adapted to receive a plug 18,7. The plug is provided with a transverse passage 188, communicating with the passage 185, and is further provided with a central means of va port l borev 189. This bore is provided with a valve seat adapted to be engaged by a valve 1'90. The valve i's normally retained on its seat by means of a coil spring 191, arranged around the valve stem 192. The valve stem is adapted to reciprocate in a guide or cage 193. Beyond'the valve, the'bore 189 is enlarged and communicates with the chamber 183, as shown. `The valve stem isextended beyond the valve, as shown at 194, and 1s adapted'to be enga ed by a head 195', formed 1 on a reclprocating ever 196 to permit manual operation of the'valve. As shown, this' lever passes through the plug 1 87 and throng a central opening 1n a packlng nut Thecylinder yoke is provided with a pair of depending arms'198 which are arranged at the front and diverge and which may be connected to the .cylinder yokev by inclined arms 199. The lower portions of the arms 198 are provided with substantially flat faces 200. The frame of the machine is provided with lugs 201, adapted to be engaeed by the vfaces 200 when the fluid is intro uced into the inner end of the cylinder to force the pistons outwardly and move the shovel forwardly in the-crowdin operation. y

.When the cylinder,l i per'and associated parts areelevated for umping, means are provided to prevent the bushing 68 from moving. rearwardly in the guides formed by the fiat faces 64 and 65. frame of the machine is provided with a block or extension 202, arranged in front of each of the bushing guides and these blocks are provided with curved faces. 203, curved on an arc from rthe center of the bushing 68, when the bushing 1s in a position at the front of the guide. The cylinder yoke is provided with lateral extensions 204, which are adapted to engage the curved faces 203- and thus prevent rearward movement of the bushing and its associated' partsv when the parts are in an elevated or inclined position.

Suitable means are provided to lock the dipperA beams against rearward movement when they are in extended position whereby introduction of air or other fluid into the outer end of thev cylinder will cause the cylinder and its associated parts to swin lon its pivot to elevate the dipper. With t e dipper in the dotted line position shown in Figure l of the drawings, introduction of air into the outer end of the cylinder moves the pistons inwardly. The rearward movement vof the pistons is transmitted to the dipper beams through the cross head 155 and this ytends to swing the guide arms 162 about the shaft 164 asa pivot. The forward movementl of the beams has caused the arms 170 to assume a-position nearer to the vertical and raise the outer end of the yoke formed by the diverging arms 168. When the pis'- tons move rearwardly, the dash pots prevent As shown, the

the diverging arms from being lowered and '171, and these pivots, and the pivots between the guide arms 162 and the dipper beams act as a double fulcrum to raise the dipper oil -the ground. During this time, the lower ends of the guide arms travel rearwardly in a reverse direction over a ortion of the arc described by them during t e forward move# ment of the pistons and means are provided to arrest this rearward movement and cause. the cylinder, dipper and associated parts to swing to a substantially vertical position when air pressure is introduced into the for-` ward end of the cylinder. As shown, suitable latches 205 are mounted on a shaft206 adjacent the rear of the base. These latches are normally retained in raised position by means of a spring 207. During the forward movement ofthe guide arms, they ride over thev latches 205 and depress them. The lower ends of the flattened portions 208, which are adapted to be engagedA by the latches 205 on their return movement.

Suitable means are provided for releasing the latches 205 and the dash pots to permit the cylinder, dipper and' associated vparte to be lowered after thecontents of the dipper have been dumped. As shown, an arm or crank`209 is secured to the shaft 206 and eX- tends upwardly therefrom. This crank is rovided with a pin adapted to be received 1n a slot 210 formed in alink 211. The forward end of this link is pivotally connected to a crank 212 formed on an operating shaft 213. A suitable pedal 214 is carried by the shaft, .whereby the shaft may be revolved by depressing the pedal. The shaft isv further provided with a crank or arm 215, adapted to engage the lever 196 to open the valve 191 and permit the fluid in the cylinders 417 4 to flow into the reservoir 175 and thus release7 the yoke formed by the Vdiverging arms 168 and permit it to swing about the shaft 164, as a pivot and return to normal position.

The dipper beams are provided `with de pending portions 216,v adjacent their forward ends and these de ending portions are provided with inclined lower faces 217, adapted to engage the dipper lid and retain it in position. The depending portions 216 may be connected by a transverse member 218, forming a brace.

Suitable means are provided for releasing the latch bar 145 from the catches 143 whenthe dipper is in dumping position. A flexible cable 219 is connected to the clip 147 formed on the latch bar and this cable passes upwardly over an idler pulley v219 carried by one of the dipper beams. The cableis ide arms are provided with y then passed rearwardly over the hub surrounding the pivot point 171 and is then extend-ed forwardly and upwardly over the pivot pin connecting the arm 170 to the diverging arm 168. The end of the cable is fastened on a bracket 220 `carried by the frame of the machine.

An operator-s platform is arranged on one side of the machine and supported from the base. As shown, suitable lugs 22() are secured to the upper ring 6 of the base and a platform 221 is secured to these lugs. A. standard 222 extends upwardly from the platform and is adapted to receive a seat 223. A. vertically disposed partition wall or shield 224 is arranged between the platform and the machine. A. guard rail 225 extends from the seat support to the shield, as shown. As shown, the valve handle 60 and the latch release pedal 214 are arranged above the operators platform and are readily accessible in the operation of the machine.

The base of the machine is provided with side bars 226, which extend rearwardly and are adapted to receive a transverse stabilizing bar 227. This bar extends an appreciable distance on each side of the machine and is employed to prevent the machine from tipping when the upper part is arranged at 4an angle to the base. Rail clamps 228 may also be employed to retain the machine in a set position.

ln operation, the machine is capable of successive steps whereby the dipper is forced into a bank or pile of material and is then oscillatcd to fill the dipper, raised to an elevated position and turned around the base as an axis and then extended over a cart, car, or other vehicle body into which the contents of the dipper are to be dumped, then returned to its original elevated position and then lowered to the starting position. These operations are generally referred to as crowding, digging, elevating, revolving, reaching, dumping, returning, and recovering. An important feature of the device is that it is not a cycle machine and any of the operations may be stopped at any time. Thus the crowding may be discontinued before the pistons travel the full length of the cylinder, and the digging step begun, or4

crowding and digging may be accomplished simultaneously.

With the parts in the position shown `in full lines in Figure 1 of the drawings, ythe pistons and 76 are at the inner end of the cylinder, as shown in Figure 4 of the drawings. The valve 111 is swung in a clockwise direction to connect the forward end of the cylinder with the exhaust port 98 and conneet the assage 89 to the source of iuid through t e pipe 50. The pistons then move outwardly, moving the dipper forwardly to the dotted line position shown in Figure 1 of the drawings. This is the crowding step, and places the dipper in proper position for digglng. During this operation, the guide arm 162 will swing about the shaft 164 as a pivot and assume a position over the base.

-reservoir 175 into the bottom of cylinders 174. The crowding step may be continued until the pistons assume a position adjacent the outer end of the cylinder or may be terminated at any time intermediate the full line position shown in Figure 1 of the drawings and the dotted line position shown.

During the crowding operation, the Hat faces 200 of the depending arms 198 of the cylinder yoke engage the lugs 201. This places the thrust on the machine at a comparatively low point and removes any strains from the cylinder supporting mechanism. It further prevents the front end of the device from tipping during the crowding operation. The` bushings 68 move rearwardly in the guides to cause the flat faces 200 to engage the lugs 201 at the beginning of the crowding operation.

At the end of this step, the parts are in position for the digging operation which is accomplished by swinging the dipper around the pins 151 as a pivot. To accomplish this, the iuid is admitted to the space between the pistons through the passage 88. The valve 111 is moved inwardlyby moving the handle 120 on the pin 22 as a pivot and forcing the lever 116 inwardly. This permits the fluid to enter the passage 88 whence it passes through the tube 81 to the interior of the inner i piston rod 77 and thence through the passage 90 to the space between the pistons. This causes relative movement of the `piston rods 77 and 79, the outer pistonv rod 79 being extended with respect to the inner piston rod. The connection of the collar 128 to the inner piston rod through thc medium of pin 127 causes this collar to move on the outer piston rod and the yoke 134 is moved rearwardly with respect to the outer piston rod, swinging the dipper arms" 140 in a counter clockwise direction and swinging the dipper m an arc of a circle toward the bank or pile to be dug in what operation.

may be termed a scooping This operation may be repeated several times to insure filling the dipper` if necessary. During the forward movement. of the dipper, the extensions 216 of the dipper beams engage the dipper lid 144, forming a brace therefor. The lid is retained in position by the latches 143 and the latch bar 145.

lil)

At the end of the digging operation, the.

the yoke 168 from being lowered. When `the lower end ofthe guide lever asses over the rear portion of the base, the atches 205 are depressed against the tension of the spring 207. The latches immediately return to normall position and will prevent rearward movement of the guide arm until they are released. y

At the end of the digging operation, the dipper is ready to be e evated to dump the load in a car or other vehicle arranged beside the shovel. `The valve 111 is then revolved in a counter clockwise direction to connect the passages 88 and 89 to the ex.

haust port 98 and connect the forward end of the cylinder to the source of pressure. The fluid entering the forward end of the cylinder moves the, pistons 75 and 76 rearwardly in the cylinder and the dipper beams 153 and the 'dipper move with the pistons and piston rods. At the beginningof this movement, the g ide arms 162 begin to swing in an are ofa circle in a reverse direction from their movement during the crowding operation and the pull exerted on the lever 170 by the dipper beams tends to move the yoke 168 `to its original position. The yoke, however is locked against movement 1n this direv tion by the piston rods 173 of the dash poi-[mechanism and the force exerted causes the cylinder and cylinder yoke to swing about the trunnon 69 Vas a pivot and assume the broken line position shown in Figure 1 of'the drawings. This action continues with the dash pot mechanism forming the restraining influence to prevent the return of the parts to their initial position and causing the cylinder to be elevated until the guide arms 162 are moved a suflicient distance rearwardly to cause the lower'ends 208 to engage the latches 205. 'lhe continued introduction of iluid into the forward end of the cylinder then causes the cylinder, dipper and associated parts to swingto a fully elevated position, shown in Figure 1 of the drawings, the latches 205l preventing further rearward movement of the guide arms 162 and the point of. engagement of the guide arms 162`and the latches serving as a fulcrum during the latter part of the elevating movement. The dash pot mechanism then ceases to servev as supporting means and are driven further upwardly as the parts move to a fully elevated posi.

tion. At the end of the elevating movement, the extensions 204 on the sides of the cylinder yoke en age the arcuate faces 203 on the block 202. ith the parts in -the elevated position, the entire upper frame is revolved on .the base to permit the dipper to be extended laterally or atan angle to its original. position over a car or lother vehicle intowhich the contents of the dipper are to be dumped. This is accomplished by admit-- ting air to the engine cylinders 31, the introduction of air being controlled bythe valve -51 through the, medium of the handle 60 arranged on the opera-tors platform 221.

The piston rods31 drive the. crank 27 to rotate the pinion 21 and this pinion in turn rotates the pinion 22 which is in engagement- With the ring gear 17, causing the rings 6 and 7 to revolve on the stationary base and thus turn the frame on which the` cylinder and other parts are supported.

At thel end of. the revolving step, when the cylinder, dipper and associated parteI are arranged at the desired angle to the base` fluid is again admitted to the inner end of the cylinder to move the pistons in the c vlinder and force lthe piston rods outwardly.-

This is known as the reaching operation -and is forthe purpose of forcing the dipper outwardly to a position over the cur or other vehicle into which the contents of the dipper are to be dumped. During the reaching operation, the engagement of the lateral extensions`204 and the arcuate faces y208 preveuts rearward movement of the bushings 68 in the guides and takes up the thrust. By retaining the bushings 68 at the forward ends of the guides, the full advantage of thepiston rod extension is obtained during the reaching step. The cable 218 which controls the latch bar of the dipper lid extends around the idler pulley 219 which is at all times substantially the saine distance from the hub 171 and then extends around 'the h ub 171 and the huh formed at the other end of the arm 170. From this point` the v cable extends to thebracket 220 von the frame and the tautness of the cable is controlled by the distance from the'bracket 220 to they outer end of the -yoke 168. During the elevation of the cylinder, dipper andv associated parts, the yoke 168 revolves in a counter-clockwise direction and travels away from the bracket 220 which causes any slack in the cable to be taken up and 'the cable becomes taut. During the reaching operation, the cable remains in this taut condition andwhen the dipper is oscillatcd on its pivots 151 for dumping, the cahlc exerts a llU pistons in a manner similar to the digging operation heretofore described.

At the end ot the dumping operation, the parts are returned to the original elevate-d position by admitting air to the forward end of the cylinder. The apparatus is then in condition to be returned to its original position and the operator depresses the pedal 214 which revolves the shaft '213 and causes the shaft 206 to be rotated through the cranks 209 and 212 and the link 211. The latches 205 are then depressed against the tension of the spring 207, disengaging the latches from the lower ends of the guide arms162. Further movement of the .shaft 213 causes the crank 215 to engage lever 196 and unseat the valve 190. This permits the oil in the cylinders 174 to return to the reservoir 175, releasing the dash pot mechanism. The cylinder, dipper and associated parts are then free to return to their original positions, and during the lowering ot the parts, the dash pot mechanism serves as cushioning means. By controlling the speed of the flow of oil from ,the cylinders, the speed at which the parts are lowered may be regulated.

The cup-shaped members 91 and 107 ar.-

- ranged in the opposite ends ot the cylinder serve to entrap a certain amount of air in the ends of the cylinder, and form cushions for the pistons when the pistons reach the ends of a stroke. The air is normally passed into the cylinder through thecpenings 93 and 108 in the inner ends of the cup-shaped members, which openings are normally disosed a slight distance `from the cylinder eads. The springs 95 and 109 normally retain the parts in the position shown. As the piston moves toward the end ot the cylinder, the tace of the piston engages the inner end of the cup-shaped member and closes the air inlet opening. The air thus cntrapped in the end of the cylinder forms a cushion for the piston. The spring permits the cup-shaped member to be moved inwardly by the piston and when the piston again moves outwardly away from the cylinder head. the spring returns the cup-shaped member to its normal position.

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same, and that. various changes in the shape', size, and arrangement of parts may be resorted towithout departing trom the spirit of the invention or the scope of the subjoined claims.

I claim:

1. Tn a power operated shovel, a dipper,-

adapted to be elevated when said dipper is moved forwardly, and means forlocking said ivoted member in elevated position where iy application of Jforce to said actnating member in a reverse direction causes said dipper to assume an elevated position.

2. 1n a power operated shovel, a dipper, an actuating member connected thereto, means for moving said actuating' member and said dipper forwardly, a pivotally mounted yoke operatively connected to said dipper and adapted to be elevated when said dipper is moved forwardly, and means tor locking said yoke in elevated Vposition whereby application of force to said actuating member in a reverse direction causes 'said dipper to assume an elevated position.

3. In a power operated shovel, a cylinder, a piston mounted therein, a piston rod connected to said piston, a dipper arranged on the outer end of said piston rod, a pivoted member operatively connected to said piston rod, and adapted to be elevated when said piston rod is moved forwardly, and means tor locking said pivoted member in elevated position whereby movement of said piston in a reverse direction will elevate said dipper.

1l. In a power operated shovel,'a frame, a cylinder pivotally mounted on said frame, a piston mounted therein, a piston rod conv nected to said piston, a dipper arranged on the outer end ot said piston rod, a pivotallv mounted yoke operatively connected to said piston rod and adapted to be elevated when said dipper is moved forwardly, and means for locking said yoke in elevated position whereby movement of said piston in a reverse direction will swing said cylinder on its pivot and cause said dipper to assume an elevated position.

5. ln a power operated shovel, 'a trame, a cylinder pivotally mounted on said frame, a piston mounted therein, a piston rod connected to said piston,- a dipper arranged on the end of said piston rod, longitudinally arranged dipper beams mounted on said trame and connected to said piston rod, a link connected to said beams, a pivotally mounted member `connected to said link whereby outward movement of said piston will elevate said pivotally mounted member, and means for locking said pivotally mounted member in an elevated position whereby movement of said pistou in a reverse direction will swing said cylinder on its pivot and elevate said dipper.

6. ln a power operated shovel, a frame, a cylinder pivotally mounted on said frame, a piston mounted therein, a piston rod connected to said piston, a dipper arranged on the end of said piston rod, longitudinally arranged dipper beams mounted on said frame and connected to said piston rod, a link connected to said beams, a pivotally mounted yoke connected to said link, said link being adapted to elevate the .free end of said yoke when saidV pistony moves forwardlyy in said cylinder, and means for lock'- ing said yoke in elevated position whereby movement of said piston in a reverse direction will swingsaid cylinderon its pivot and elevate said dipper.

7. In a power operated shovel, a cylinder, a piston mounted therein, a piston rod connected to said piston, a dipper carried by said piston rod, a dipper beam operatively connected to said piston rod, a pivotally mounted guide arm connected to said beam, a latch arranged in the path of said guide arm, said guide arm being adapted to pass over said latch when said piston moves forwardly and being adapted to engage said latch when said piston moves in a reverse direction to elevate said dipper.

8. In a power operated shovel, |a dipper, an actuating member connected thereto,

means for moving said actuating member and said dip er forwardly, a pivoted member operative y connected to said dipper, the free end of sa1d member being adapted to be elevated when said dipper is moved forwardly, and dash pot mechanism connected to said'member to retain it in elevated position whereby application of force to said actuating member in a reverse direction causes said dipper to assume an elevated position. l 9. In a ower operated shovel, a dipper',

.an actuatlng member connected thereto,

means for moving said dipper and saidactuating member forwardly, a pivotally mounted yoke operatively connected to said dipper and adapted to be elevated when said dipper is moved forwardly, a piston rod connected to said yoke, a pivotally mounted cylinder arranged beneath said` yoke, a piston mounted in said cylinder and connected to said piston rod,4 and a suction operated valve arranged in said cylinder and adapted to be opened by the upward movement of said piston, whereby said yoke is retained in an elevated position and rearward movement of said actuating member causes said dipper to assume an elevated position.

10. In a power operated shovel, a dipper, an actuating member connected thereto,

,. means for moving` said dipper and said actuating member forwardly, a ivoted member o eratively connected to said dipper, the ree end of 4said member being adapted tobe elevated when said di per is moved forwardly, a ivotally mounte cylinder arranged beneat said pivoted member, a liquid reservoir communicating with said cylinder, a iston mounted in said cylinder a piston vrod -secured thereto and connected to said pivoted member, and a suction operated valve adapted .to be opened upon upward movement of said piston.

said piston rod an adapte to be elevated l when said piston rodis moved forwardly, a pivotally mounted cylinder arranged beneath said pivoted member, a piston mounted in said cylinder, a piston rod secured to said piston and connected to said pivotedv member, areservoir communicating with said cylinder, and a suction operated -valve controlling communication between said cylinder. and said reservoir, said valve bemg adapted to be opened upon upward movement of said piston.

12. In a power operated shovel, a frame, a cylinder pivotally mounted on's'aid frame, a piston mounted therein, a piston rod connected to said piston, a dipper arranged on the outer end of said piston rod, a pivotally mounted yoke operatively connected to said piston rod and adapted to be elevated when said dipiper is moved forwardly, a pivotally mounte cylinder arranged beneath said yoke, a liquid reservoir communicating with said cylinder, a piston mounted in said cylinder, a piston rod secured thereto and connected to said yoke, and a suction operated valve adapted to be opened upon upward movement 'of said piston.

13. In a power operated shovel, a frame, a cylinder pivotally mounted on said frame, a piston mounted therein, a piston rod connected to said piston, a dipper arranged on the end of said piston rod, longitudinally extending ldipper beams connected to said piston rod, a link connected to'said beams, a ivotally mounted member connected to sald link whereby outward movement of said piston will elevate said pivotally mounted member, a pivotally mounted cylinder arranged beneath saidpivotally mounted member, a liquid reservoir communicating with said cylinder, a piston mounted in said cylinder, a piston rod secured thereto piston rod, a ink connected vto said beams,

a pivotally mounted yokeconnected to said f t link, said link being adapted to elevate the free end of said yoke when said piston moves forwardly in said cylinder, a pivotall mounted cylinder arranged beneath said yo e, a liquid reservpir communicating with said cylinder, a piston mounted 1n' sind 

